Tilman Hausherr created PDFBOX-3404:
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Summary: Threads using PDFBox getting stuck when using standard 14
fonts
Key: PDFBOX-3404
URL: https://issues.apache.org/jira/browse/PDFBOX-3404
Project: PDFBox
Issue Type: Bug
Components: PDModel
Affects Versions: 2.0.0
Reporter: Tilman Hausherr
user @Patrick Stahle reports:
{quote}
We have a relatively heavily threaded application which is calling pdfbox to
stamp certain
pdf files. We have been in production for a little over a week and have run
into a few threads
getting stuck. The stack trace is the following:
{quote}
{code}
### Thread id=34, name="dispatch_2_20160626211454_1064"
# ThreadInfo: "dispatch_2_20160626211454_1064" Id=34 RUNNABLE
# CPU: threadCpuTime=49,541,548.824 ms, threadUserTime=49,538,533.066 ms
# Contention: blockedCount=33 , blockedTime=123 ms
# Contention: lockName=null , lockOwnerId=-1, lockOwnerName=null
java.util.HashMap.put(HashMap.java:473)
java.util.HashSet.add(HashSet.java:217)
java.util.AbstractCollection.addAll(AbstractCollection.java:334)
org.apache.pdfbox.pdmodel.font.encoding.Encoding.contains(Encoding.java:109)
org.apache.pdfbox.pdmodel.font.PDType1Font.encode(PDType1Font.java:343)
org.apache.pdfbox.pdmodel.font.PDFont.encode(PDFont.java:286)
org.apache.pdfbox.pdmodel.font.PDFont.getStringWidth(PDFont.java:315)
com.tycoelectronics.emcs.stamppdf.StampEnginePDFBox.getLongestTextWidth(StampEnginePDFBox.java:1369)
{code}
{quote}
We seem to be getting stuck in PDFont classes HashMap which is unsynchronized
class.
{quote}
{quote}
We are using "PDType1Font.HELVETICA".
{quote}
The problem is that for the standard 14 fonts, each font is a singleton, but
its code is being used multithreaded, so we have to secure that.
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